I pushed for wireless offline. It gives you a camera and a monitor. Wireless with plenty of range. Two way talk. White noise options on the camera.
The biggest advantage is that it's something you can leave on and open. I know if my baby is coughing or hiccuping or yelling immediately. I'm not getting a little ding on my phone that says my camera heard something. That wouldn't wake me up.
I just got the v tech from Walmart. It was expensive and the best I can say about it is that it's sufficient. We needed one in a pinch. I'd do real research if you go this route.